Originally Posted by Campag4life

True. Above is pretty obvious to engineers that look at the design of BB30 and contrast it to an external bearing threaded BB.

As I stated in previous threads, I believe that PF30 will supercede BB30 for some of the reasons you mentioned. But not PF30 in its present form. Praxis has come forward with a very solid aftermarket BB to be used with PF30. It maintains PF30 Delrin bushings in fact. But major difference. It is a collet sleeve that expands radially when threaded in place. This uniform expansion works nicely with a plastic bushing and hard carbon shell. But there's more. The reason why it is so effective is...it is a solid sleeve that is stabilized by both both sides of the BB..unlike current PF30 where bearings are independent...the true achilles heel of both BB/PF30 in contrast to threaded BB.

I foresee that BB30 will go away over time...in part because it offers very little economic advantage as you state compared to threaded BB and PF30 if done properly can be made rock solid and maintain the advantage of larger diameter crank spindle.